Disliked how the girl shut in place instead of saying she decided to ignore the guy after all the bad things he told to her.
And when the class decided to put them together she got even more silent, I understand morality reversal and how for them the bastard is a weak girl in our world but c'mon.
Very weak under pressur eand playing the stereotype that japanese people can't say "no".
Feel free to spoiler me but I think the only way to fix it is by making MC accompany her to school and make clear they are together and MC explaining openly how she was put under pressure and couldn't react.
The thing of them eating together and all put in the classmates the image that they are together, so unfortunately is very likely the schoolmates will think she is the bad one and was double timing.